Converts the specified string representation of a date and time to its DateTimeOffset equivalent using the specified format and culture-specific format information. The format of the string representation must match the specified format exactly.

Converts the specified string representation of a date and time to its DateTimeOffset equivalent using the specified format, culture-specific format information, and style. The format of the string representation must match the specified format exactly.

Converts the specified string representation of a date and time to its DateTimeOffset equivalent using the specified formats, culture-specific format information, and style. The format of the string representation must match one of the specified formats exactly.

Converts the specified string representation of a date and time to its DateTimeOffset equivalent using the specified format, culture-specific format information, and style. The format of the string representation must match the specified format exactly.

Converts the specified string representation of a date and time to its DateTimeOffset equivalent using the specified array of formats, culture-specific format information, and style. The format of the string representation must match one of the specified formats exactly.

The DateTimeOffset structure includes a DateTime value, together with an Offset property that defines the difference between the current DateTimeOffset instance's date and time and Coordinated Universal Time (UTC). Because it exactly defines a date and time relative to UTC, the DateTimeOffset structure does not include a Kind member, as the DateTime structure does. It represents dates and times with values whose UTC ranges from 12:00:00 midnight, January 1, 0001 Anno Domini (Common Era), to 11:59:59 P.M., December 31, 9999 A.D. (C.E.).

The time component of a DateTimeOffset value is measured in 100-nanosecond units called ticks, and a particular date is the number of ticks since 12:00 midnight, January 1, 0001 A.D. (C.E.) in the GregorianCalendar calendar. A DateTimeOffset value is always expressed in the context of an explicit or default calendar. Ticks that are attributable to leap seconds are not included in the total number of ticks.

Although a DateTimeOffset value includes an offset, it is not a fully time zone-aware data structure. While an offset from UTC is one characteristic of a time zone, it does not unambiguously identify a time zone. Not only do multiple time zones share the same offset from UTC, but the offset of a single time zone changes if it observes daylight saving time. This means that, as soon as a DateTimeOffset value is disassociated from its time zone, it can no longer be unambiguously linked back to its original time zone.

Because DateTimeOffset is a structure, a DateTimeOffset object that has been declared but not otherwise initialized contains the default values for each of its member fields. This means that its DateTime property is set to DateTimeOffset.MinValue and its Offset property is set to TimeSpan.Zero.

You can create a new DateTimeOffset value by calling any of the overloads of its constructor, which are similar to the overloaded constructors for the DateTime structure. You can also create a new DateTimeOffset value by assigning it a DateTime value. This is an implicit conversion; it does not require a casting operator (in C#) or call to a conversion method (in Visual Basic). You can also initialize a DateTimeOffset value from the string representation of a date and time by calling a number of static string parsing methods, which include Parse, ParseExact, TryParse, and TryParseExact.

The members of the DateTimeOffset structure provide functionality in the following areas:

Date and time arithmetic.

You can add or subtract either dates or time intervals from a particular DateTimeOffset value. Arithmetic operations with DateTimeOffset values, unlike those with DateTime values, adjust for differences in time offsets when returning a result. For example, the following code uses DateTime variables to subtract the current local time from the current UTC time. The code then uses DateTimeOffset variables to perform the same operation. The subtraction with DateTime values returns the local time zone's difference from UTC, while the subtraction with DateTimeOffset values returns TimeSpan.Zero.

You can convert DateTimeOffset values to DateTime values and vice versa.

Time manipulation and extraction operations.

You can extract either the date or the time of a DateTimeOffset value. You can also retrieve the value of a particular DateTimeOffset component, such as its year or its month.

Date and time conversion.

You can convert any DateTimeOffset value to another DateTimeOffset value that represents the same point in time in another time zone. However, a time zone's adjustment rules are applied only in the case of the ToLocalTime method, which converts a DateTimeOffset value to the date and time in the local system zone.

Date and time comparison.

You can determine whether any particular DateTimeOffset value is earlier than, the same as, or later than another DateTimeOffset value. Before the comparison is performed, all values are converted to UTC.